Biogas is an important contribution to our future energy supply – and the future is now! Together with wind and solar energy, biogas plays a decisive role in the green transition with the phasing out of fossil fuels in favor of renewable and CO2-neutral energy sources. And only when the biogas plants are supplemented with storage or PtX, full potential be achieved, allowing us to speak of a fully circular economy for future energy supply.
Biogas is a green gas that both solves difficult climate challenges, contributes to an independent supply chain and makes food production more sustainable. Today, more than half a million tonnes of CO2 is captured on an annual basis in Denmark during the upgrading of biogas to natural gas quality – a number that is expected to increase considerably over the years to come. And there are several good reasons for this to happen.
CO2 from biogas is both cheap and readily available. In addition, CO2 from biogas is a very clean CO2 that exists in concentrated form and with minimal need for pre-treatment prior to compression and transportation. And because of this biogas suppliers are also expected to contribute significantly to the climate effort. The question is not whether, but how biogas will have an effect on the climate effort and by what timing and impact. Decisive for this development will be the given framework conditions, but also the demand for green fuels.
Biogas is a gas consisting of methane and CO2, which is formed when organic material rots under oxygen-free conditions. This is a natural process that the biogas plants use to degas food waste, straw, animal manure and residual products from agriculture and industry.
The biogas is either distributed to customers via the gas network or used for the production of green electricity and heat. The biogas fed into the gas network is used by industry and heavy transport, among other things. The majority of Danish biogas production is currently distributed via the gas network. The biogas that comes out of the biogas reactors contains approximately 55-65 percent methane. The rest is CO2, which is cleaned out of the biogas before the green gas is fed into the gas network. CO2 from biogas is fossil-free and originates primarily from animal manure, waste and residual products from industry and households.
There are currently around 190 biogas plants in Denmark, with a total biogas production of approx. 800 million cubic meters. In 2022, the Danish Biogas production marked a new record and covered 40% of total gas consumption.